WO2022170373A1 - Procédé de pulpage mécanique assisté chimiquement de copeaux de bois ou de chutes de bois - Google Patents

Procédé de pulpage mécanique assisté chimiquement de copeaux de bois ou de chutes de bois Download PDF

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Publication number
WO2022170373A1
WO2022170373A1 PCT/AT2022/060028 AT2022060028W WO2022170373A1 WO 2022170373 A1 WO2022170373 A1 WO 2022170373A1 AT 2022060028 W AT2022060028 W AT 2022060028W WO 2022170373 A1 WO2022170373 A1 WO 2022170373A1
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WO
WIPO (PCT)
Prior art keywords
wood
wood chips
solvent
feedstock
wood chip
Prior art date
Application number
PCT/AT2022/060028
Other languages
German (de)
English (en)
Inventor
Juha FISKARI
Original Assignee
Mondi Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mondi Ag filed Critical Mondi Ag
Priority to EP22702851.1A priority Critical patent/EP4291708A1/fr
Publication of WO2022170373A1 publication Critical patent/WO2022170373A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/10—Physical methods for facilitating impregnation
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/006—Pulping cellulose-containing materials with compounds not otherwise provided for
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/20—Pulping cellulose-containing materials with organic solvents or in solvent environment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means

Definitions

  • the present invention relates to a process for a chemically assisted mechanical pulping process for wood chips or wood chips and to paper or cardboard produced therewith.
  • wood chips or wood chips In order to obtain a suitable starting material for the production of paper, cardboard or cellulose, two different pulping processes for wood chips or wood chips are usually used in industry.
  • the so-called kraft process is usually used for the chemical digestion of wood chips.
  • wood chips or wood chips can be broken down using what is known as a semi-chemical or semi-chemical digestion process, in which a two-stage process is used.
  • thermo-mechanical digestion In addition to these two processes for breaking down wood chips or wood chips, a hybrid of the two known processes, the so-called thermo-mechanical digestion, is used, which is characterized on the one hand by a very high energy consumption and on the other hand leads to a and cardboard production leads to particularly well-suited wood pulp.
  • a method has already become known from EP 2 876 202 A1, which replaces at least part of the chemical batch in a conventional semi-chemical wood pulping process or also chemical wood pulping process by using a so-called strong eutectic solvent in order to achieve improved separation of lignin and lignocellulose as a result of the pulping process.
  • the strongly eutectic solvents used in this document are described, for example, in WO 2013/153203 A1 and consist of a salt in its liquid state that consists of a mixture of a proton donor and a proton acceptor, which mixture contains a eutectic with a forms a low melting point, which melting point is significantly lower than that of the individual components.
  • various examples of strongly eutectic solvents can be found in the document and that these can be used in connection with lignocellulosic starting materials, in particular for dissolving the lignin contained in these materials.
  • pulp suspensions of this type are usually subjected to beating in order to comminute unopened or only partially open wood particles to such an extent that they do not lead to any inhomogeneities in the product made from the wood pulp.
  • the disadvantage of grinding is that, in addition to the comminution of unbroken-up wood particles, a not inconsiderable part of the fibers of the input material is also ground up and thus be shortened, so that a final product after grinding has a fiber length distribution corresponding to a Gaussian curve, which is shifted in the direction of shorter fibers in relation to the fiber length of the heating material used.
  • the presence of longer fibers in the lignocellulosic material has the advantage that a better lattice network can be formed in the paper web and consequently, for example, papers with increased stretchability according to ISO 1924-3 can be obtained.
  • a chemically assisted mechanical pulping process for wood chips which essentially has the following steps: a) producing a feed material from wood chips; b) contacting the wood chip feedstock with steam at a first pressure of between 1 and 2 bar, a steam temperature of between 100 and 110°C for a period of between 10 and 20 minutes to produce a steamed wood chip feedstock; c) contacting the vaporized wood chip feedstock with a solution containing a strong eutectic solvent comprising a quaternary ammonium salt and a co-solvent at a temperature between 40 and 120°C, preferably 50 to 100 ° C and for a time between 5 and 15 minutes, preferably 5 to 10 minutes to obtain a pretreated wood chip feedstock having a strong eutectic solvent concentration greater than 92 mass.
  • -% preferably greater than 95% by mass, is selected and a remainder of the solution consists essentially of water, and wherein a molar ratio of the quaternary ammonium salt to a co-solvent is selected between 1:1 and 1:2; and d) mechanically grinding the pretreated wood chip feedstock at a pressure between 1 and 3.5 bar and a temperature above 100°C.
  • a further advantage of such a procedure is that the strongly eutectic solvent is kept at the lowest possible temperature and thus on the one hand the energy balance can be optimized and on the other hand any adverse effects on the plant, in particular its tendency to corrode or deterioration, are minimized as far as possible - ten can be, in that the eutectic solvent used is not corrosive, in contrast to the strong bases and acids usually used, corrosion of the ⁇ niagenteie can be prevented, for example, and the use of stainless steel for plant construction can be avoided as a result. This also makes it possible to prevent unwanted discoloration of the paper or cardboard web due to corroded plant parts.
  • the process is carried out in such a way that the grinding in step d) is carried out at a temperature between 100 and 160° C., in particular at a temperature which increases from 115° to around 150° C. in the course of the grinding, by Temperature is gradually raised during grinding in step d).
  • the method is conducted in such a way that the pressure in the grinding step is also increased successively from values of 1.0 to 2.5 or 3.0 or 3.5 bar.
  • the method is carried out in such a way that a choline salt or a proline salt is used as the quaternary ammonium salt. If a choline or proline salt is used, a strongly eutectic solvent can be provided which shows a particularly strong reduction in the melting point and thus allows the process to be carried out at low temperatures and relatively low energy consumption.
  • the choline salt used is a choline chloride or choline bromide or the proline salt is a proline chloride
  • an amide is used as a co-solvent, in particular an amide selected from the group consisting of urea, formamide and acetamide, which amides are strongly basic on the one hand and thus make the digestion process significantly easier and on the other hand also result in a significant reduction in the melting point of the ammonium salt and thus contribute to a strong or deep eutectic.
  • urea is particularly preferred for ecological reasons, since waste products containing urea can be landfilled or even used, for example, as fertilizer for forests or the like.
  • the invention also relates to the use of wood chips or wood chips produced according to the method of the invention and of auxiliaries and additives selected from the group of wet strength agents, flocculants, sizes, retention aids and bleaches for the production of paper or cardboard.
  • Paper or cardboard produced using wood chips or wood chips produced in this way has particularly homogeneous fibers and thus constant properties over the entire length or width of the paper produced.
  • the fiber length is significantly longer than that of conventionally produced papers and the papers also have significantly reduced air permeability, they can be used without special or additional surface treatment, particularly in cases where a particularly dense material is desired.
  • the invention is explained in more detail below using exemplary embodiments.
  • wood chips or wood chips that were produced from Norway spruce (Picea abies) using a reduction device, for example a chipper were used.
  • the wood chips were subjected to steaming, which steaming for a period of 10 minutes at a pressure of at least 1.0 bar, in particular a pressure between 1.0 and 1.5 bar and a steam temperature of over 100° C, advantageously around 110 °C.
  • the purpose of steaming is to remove air from the wood chips or the wood chips as well as to raise the temperature of the wood chips and to stabilize it at the selected level.
  • the chips were soaked in a strong eutectic solvent.
  • the steamed wood chips were soaked at 50 °C and at 70 °C in the strongly eutectic solution consisting of choline chloride and urea as well as that consisting of choline chloride and glycerine.
  • the wood chips or wood chips obtained in this way were fed to a grinding device or a refiner and subjected to a grinding process there as follows: water was injected in a preheating stage in order to adjust a wood pulp to a mass content of 25%. The grinding was then started and the temperature was gradually increased from an initial temperature of 100° C. to 150° C. and the pressure in the grinding chamber was raised in the same way from 1 bar to at least 3.0 bar, in particular 3.5 bar. The grinding was continued until the specific energy consumption reached 2,000 kWh/t.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Abstract

L'invention concerne un procédé de pulpage mécanique assisté chimiquement de copeaux de bois, ledit procédé consistant : a) à produire une charge d'alimentation à partir de copeaux de bois ; b) à mettre la charge d'alimentation en contact avec de la vapeur à une pression comprise entre 1 et 2 bars et une température de vapeur comprise entre 100 et 110 °C pendant 10 à 20 minutes afin de produire une charge d'alimentation de copeaux de bois traitée à la vapeur ; c) à mettre la charge de copeaux de bois traitée à la vapeur en contact avec une solution contenant un solvant eutectique profond comprenant un sel d'ammonium quaternaire et un co-solvant entre 40 et 120 °C et pendant 5 et 15 minutes afin d'obtenir une charge d'alimentation de copeaux de bois prétraitée, une concentration du solvant eutectique profond étant supérieure à 92 % en poids et une quantité résiduelle de la solution consistant essentiellement en eau, et dans laquelle un rapport molaire du sel d'ammonium quaternaire à un co-solvant est choisi pour être compris entre 1:1 et 1:2 ; et d) à broyer mécaniquement la charge d'alimentation de copeaux de bois prétraitée à une pression comprise entre 1 et 3,5 bars et à une température supérieure à 100 °C. L'invention concerne également un papier ou une plaque produits à l'aide de ce dernier.
PCT/AT2022/060028 2021-02-12 2022-01-31 Procédé de pulpage mécanique assisté chimiquement de copeaux de bois ou de chutes de bois WO2022170373A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22702851.1A EP4291708A1 (fr) 2021-02-12 2022-01-31 Procédé de pulpage mécanique assisté chimiquement de copeaux de bois ou de chutes de bois

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50089/2021A AT524693B1 (de) 2021-02-12 2021-02-12 Verfahren für ein chemisch unterstütztes mechanisches Aufschlussverfahren von Hackschnitzeln bzw. Hackspänen
ATA50089/2021 2021-02-12

Publications (1)

Publication Number Publication Date
WO2022170373A1 true WO2022170373A1 (fr) 2022-08-18

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Family Applications (1)

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PCT/AT2022/060028 WO2022170373A1 (fr) 2021-02-12 2022-01-31 Procédé de pulpage mécanique assisté chimiquement de copeaux de bois ou de chutes de bois

Country Status (3)

Country Link
EP (1) EP4291708A1 (fr)
AT (1) AT524693B1 (fr)
WO (1) WO2022170373A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013153203A1 (fr) 2012-04-12 2013-10-17 Technische Universiteit Eindhoven Prétraitement de biomasse lignocellulosique et récupération de substituants au moyen de mélanges naturels de solvants eutectiques profonds (des)/composés présentant des températures de transition basses
EP2876202A1 (fr) 2013-11-25 2015-05-27 CEPI aisbl Utilisation de solvants eutectiques profonds dans la production de papier
EP3023539A1 (fr) * 2014-11-18 2016-05-25 UPM-Kymmene Corporation Procédé de production de pulpe
WO2017032926A2 (fr) * 2015-08-27 2017-03-02 Teknologian Tutkimuskeskus Vtt Oy Procédé de conversion de biomasse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI129866B (fi) * 2019-05-15 2022-10-14 Lappeenrannan Lahden Teknillinen Yliopisto Lut Menetelmä lignoselluloosamateriaalin fraktioimiseksi ja mainitulla menetelmällä saadut tuotteet
AU2020100319A4 (en) * 2020-03-04 2020-05-14 Qilu University Of Technology Method for preparing cellulose nanofibrils by deep eutectic solvent pretreatment
CN112431055A (zh) * 2020-11-16 2021-03-02 陕西科技大学 一种由造纸用化学浆制备溶解浆的新工艺

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013153203A1 (fr) 2012-04-12 2013-10-17 Technische Universiteit Eindhoven Prétraitement de biomasse lignocellulosique et récupération de substituants au moyen de mélanges naturels de solvants eutectiques profonds (des)/composés présentant des températures de transition basses
EP2876202A1 (fr) 2013-11-25 2015-05-27 CEPI aisbl Utilisation de solvants eutectiques profonds dans la production de papier
EP3023539A1 (fr) * 2014-11-18 2016-05-25 UPM-Kymmene Corporation Procédé de production de pulpe
WO2017032926A2 (fr) * 2015-08-27 2017-03-02 Teknologian Tutkimuskeskus Vtt Oy Procédé de conversion de biomasse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PRATIMA BAJPAI: "Bierman's Handbook of Pulp and Paper: raw material and Pulp making", 2018, ELSEVIER AMSTERDAM

Also Published As

Publication number Publication date
AT524693A1 (de) 2022-08-15
AT524693B1 (de) 2022-11-15
EP4291708A1 (fr) 2023-12-20

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